JPH07238826A - Exhaust emission control device for internal combustion engine - Google Patents

Exhaust emission control device for internal combustion engine

Info

Publication number
JPH07238826A
JPH07238826A JP6052669A JP5266994A JPH07238826A JP H07238826 A JPH07238826 A JP H07238826A JP 6052669 A JP6052669 A JP 6052669A JP 5266994 A JP5266994 A JP 5266994A JP H07238826 A JPH07238826 A JP H07238826A
Authority
JP
Japan
Prior art keywords
temperature
exhaust gas
purifying
internal combustion
combustion engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP6052669A
Other languages
Japanese (ja)
Other versions
JP2983429B2 (en
Inventor
Takuya Aoki
琢也 青木
Yuichi Shimazaki
勇一 島崎
Taku Komatsuda
卓 小松田
Hiroaki Kato
裕明 加藤
Akihisa Saito
彰久 斎藤
Riichi Oketani
利一 桶谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP6052669A priority Critical patent/JP2983429B2/en
Priority to US08/391,029 priority patent/US5634331A/en
Publication of JPH07238826A publication Critical patent/JPH07238826A/en
Priority to US08/728,977 priority patent/US5713198A/en
Application granted granted Critical
Publication of JP2983429B2 publication Critical patent/JP2983429B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0835—Hydrocarbons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • F01N3/2026—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
    • F01N3/222—Control of additional air supply only, e.g. using by-passes or variable air pump drives using electric valves only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/12—Combinations of different methods of purification absorption or adsorption, and catalytic conversion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
    • F01N2550/03—Monitoring or diagnosing the deterioration of exhaust systems of sorbing activity of adsorbents or absorbents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

PURPOSE:To reduce electric power consumption by a heating means by actuating the heating means on condition that the temperature of a suction means sucking green constituents in exhaust gas is equal to or more than a specified temperature. CONSTITUTION:An ECU 9 reads the temperature TADS of a suction means 3 and the temperature TEHC of a catalyst with a heater 4 first, and judges whether or not the temperature TADS is higher than a specified temperature TADSO (for example 150 deg.). When TADS TADSO exists, the specified (switch 12) turned the heater (switch 12) is turned off. Meanwhile, when TADS>TADS) exists, it is judged whether or not the temperature TEHC of the catalyst with a heater 4 is lower than a specified temperature TEHCO (for example, 350 deg.). When TEHC>TEHCO exists, the heater is turned off. Meanwhile, when TEHC <TEHCO exists, it is judged whether or not a specified period of time has elapsed (for example, 60 seconds) since an engine was started. If it is before a specified period of time has elapsed, the heater is turned on, and it will be turned off after it will have elapsed.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、排気通路に排気ガス中
未燃成分を吸着する吸着装置を有する内燃機関の排気ガ
ス浄化装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas purifying apparatus for an internal combustion engine having an adsorption device for adsorbing unburned components in exhaust gas in an exhaust passage.

【０００２】[0002]

【従来の技術】機関の始動直後のような機関の低温時に
は、排気ガスの浄化を行う触媒コンバータが活性化して
いないため、機関内で燃焼せずにそのまま排出される燃
料成分（未燃成分）により排気ガス特性が一時的に悪化
する傾向がある。2. Description of the Related Art At low engine temperatures, such as immediately after engine startup, a catalytic converter that purifies exhaust gas is not activated, so fuel components (unburned components) that are discharged as they are without burning in the engine. Therefore, the exhaust gas characteristics tend to deteriorate temporarily.

【０００３】この問題を解決するため、機関の排気通路
に未燃成分を吸着する吸着装置とともにヒータ付の触媒
コンバータを設けるようにした排気ガス浄化装置が既に
提案されている（実開平４−１０５９２５号公報）。In order to solve this problem, an exhaust gas purifying device has been proposed in which an exhaust device for adsorbing unburned components and an catalytic converter with a heater are provided in an exhaust passage of an engine (actually developed 4-105925). Issue).

【０００４】[0004]

【発明が解決しようとする課題】機関の排気通路に装置
される吸着装置は、一般にその温度が低い状態では未燃
成分を吸着するが、温度が上昇すると吸着した未燃成分
を脱離するという特性を有する。ところが、上記従来の
装置ではヒータへの通電開始時期が、吸着装置の脱離開
始時期と無関係に設定されるため、必要以上に早くヒー
タへの通電が開始される場合があった。そのため、バッ
テリからの電力消費低減という点で改善の余地が残され
ていた。The adsorber installed in the exhaust passage of the engine generally adsorbs unburned components when the temperature is low, but desorbs the adsorbed unburned components when the temperature rises. Have characteristics. However, in the above-mentioned conventional device, the energization start time to the heater is set independently of the desorption start time of the adsorption device, so that the energization to the heater may be started earlier than necessary. Therefore, there is room for improvement in terms of reducing power consumption from the battery.

【０００５】また、上記従来の装置では吸着装置の劣化
については考慮していないため、性能が劣化した吸着装
置をそのまま使用して排気ガス特性を悪化させるおそれ
があった。Further, in the above-mentioned conventional device, since the deterioration of the adsorption device is not taken into consideration, there is a possibility that the exhaust gas characteristic may be deteriorated by using the adsorption device having deteriorated performance as it is.

【０００６】本発明は、上述した点に鑑みなされたもの
であり、触媒コンバータの加熱装置の作動を適切に制御
し、電力消費の低減を図ることができる排気ガス浄化装
置を提供することを第１の目的とし、さらに吸着装置の
劣化を検出する機能を有する排気ガス浄化装置を提供す
ることを第２の目的とする。The present invention has been made in view of the above points, and it is an object of the present invention to provide an exhaust gas purifying apparatus capable of appropriately controlling the operation of the heating device of the catalytic converter and reducing the power consumption. A second object is to provide an exhaust gas purification device having the function of detecting deterioration of the adsorption device.

【０００７】[0007]

【課題を解決するための手段】上記第１の目的を達成す
るため本発明は、内燃機関の排気通路に設けられ、排気
ガス中の未燃成分を吸着する吸着手段と、該吸着手段の
下流側に設けられ、排気ガスを浄化する触媒を有する浄
化手段と、該浄化手段の触媒を電気的に加熱する加熱手
段とを備えた内燃機関の排気ガス浄化装置において、前
記吸着手段の温度を検出する吸着手段温度検出手段と、
少なくとも前記検出した吸着手段の温度が所定温度以上
であることを条件として前記加熱手段を作動させる制御
手段とを設けるようにしたものである。In order to achieve the first object, the present invention provides an adsorbing means for adsorbing unburned components in exhaust gas, which is provided in an exhaust passage of an internal combustion engine, and a downstream side of the adsorbing means. In an exhaust gas purifying apparatus for an internal combustion engine, which is provided on a side thereof and has a purifying means having a catalyst for purifying exhaust gas, and a heating means for electrically heating the catalyst of the purifying means, the temperature of the adsorbing means is detected. Adsorption means temperature detection means for
At least the control means for operating the heating means is provided on condition that the detected temperature of the adsorption means is equal to or higher than a predetermined temperature.

【０００８】また、上記第２の目的を達成するため本発
明は、内燃機関の排気通路に設けられ、排気ガス中の未
燃成分を吸着する吸着手段と、該吸着手段の下流側に設
けられ、排気ガスを浄化する触媒を有する浄化手段とを
備えた内燃機関の排気ガス浄化装置において、前記浄化
手段の温度を検出する浄化手段温度検出手段と、前記浄
化手段の温度上昇特性を検出する温度上昇特性検出手段
と、該検出した温度上昇特性に基づいて前記吸着手段の
劣化状態を検出する劣化状態検出手段とを設けるように
したものである。In order to achieve the above second object, the present invention is provided in an exhaust passage of an internal combustion engine, and is provided with an adsorbing means for adsorbing unburned components in exhaust gas, and a downstream side of the adsorbing means. An exhaust gas purifying apparatus for an internal combustion engine, comprising: a purifying means having a catalyst for purifying exhaust gas; a purifying means temperature detecting means for detecting a temperature of the purifying means; and a temperature for detecting a temperature rise characteristic of the purifying means. A rising characteristic detecting means and a deterioration state detecting means for detecting a deterioration state of the adsorption means based on the detected temperature rising characteristic are provided.

【０００９】さらに、前記浄化手段の触媒を電気的に加
熱する加熱手段を設け、前記温度上昇特性検出手段は、
前記加熱手段の作動中に前記温度上昇特性を検出するこ
とが望ましい。Further, heating means for electrically heating the catalyst of the purifying means is provided, and the temperature rise characteristic detecting means is
It is desirable to detect the temperature rise characteristic during the operation of the heating means.

【００１０】[0010]

【作用】請求項１の排気ガス浄化装置によれば、吸着手
段の温度が検出され、少なくとも検出した吸着手段の温
度が所定温度以上であることを条件として加熱手段が作
動する。According to the exhaust gas purifying apparatus of the first aspect, the temperature of the adsorbing means is detected, and the heating means is operated on condition that at least the detected temperature of the adsorbing means is equal to or higher than a predetermined temperature.

【００１１】請求項２の排気ガス浄化装置によれば、浄
化手段の温度上昇特性が検出され、その温度上昇特性に
基づいて吸着手段の劣化が判定される。According to the exhaust gas purifying apparatus of the second aspect, the temperature rising characteristic of the purifying means is detected, and the deterioration of the adsorbing means is judged based on the temperature rising characteristic.

【００１２】請求項３の排気ガス浄化装置によれば、浄
化手段の温度上昇特性は浄化手段を電気的に加熱してい
るときに検出される。According to the exhaust gas purifying apparatus of the third aspect, the temperature rise characteristic of the purifying means is detected when the purifying means is electrically heated.

【００１３】[0013]

【実施例】以下、本発明の実施例を図面を参照して説明
する。Embodiments of the present invention will be described below with reference to the drawings.

【００１４】図１は、本発明の一実施例に係る内燃機関
（以下「エンジン」という）及びその排気ガス浄化装置
の構成を示す図であり、エンジン１の排気通路２には、
上流側から順に排気ガス中の未燃成分（ＨＣ成分）を吸
着する吸着装置３、電気的に加熱可能なヒータ付触媒
（以下「ＥＨＣ」という）４、主としてエンジン始動直
後における排気ガス浄化のために設けられた小型のライ
トオフ触媒５及び排気ガス中のＨＣ，ＣＯ，ＮＯｘ等の
成分の浄化を行う三元触媒６が配設されている。FIG. 1 is a diagram showing the construction of an internal combustion engine (hereinafter referred to as "engine") and its exhaust gas purifying apparatus according to an embodiment of the present invention.
An adsorption device 3 that adsorbs unburned components (HC components) in exhaust gas in order from the upstream side, an electrically heatable heater-equipped catalyst (hereinafter referred to as "EHC") 4, mainly for purifying exhaust gas immediately after engine startup. A small light-off catalyst 5 and a three-way catalyst 6 for purifying components such as HC, CO, NOx in the exhaust gas are provided.

【００１５】吸着装置３にはその温度ＴＡＤＳを検出す
る温度センサ（吸着手段温度検出手段）７が装着されて
おり、その検出信号はＥＣＵ（電子コントロールユニッ
ト）９に供給される。また、ＥＨＣ４にもその温度ＴＥ
ＨＣを検出する温度センサ（浄化手段温度検出手段）８
が装着されており、その検出信号がＥＣＵ９に供給され
る。The adsorption device 3 is equipped with a temperature sensor (adsorption means temperature detection means) 7 for detecting the temperature TADS, and the detection signal is supplied to an ECU (electronic control unit) 9. In addition, the temperature TE
Temperature sensor for detecting HC (purification means temperature detection means) 8
Is mounted, and the detection signal thereof is supplied to the ECU 9.

【００１６】ＥＨＣ４のヒータの一端はスイッチ１２を
介してバッテリ１３の負極に接続され、他端は直接バッ
テリ１３の正極に接続されている。スイッチ１２はＥＣ
Ｕ９からの制御信号によりそのオン／オフが制御される
ように構成されている。One end of the heater of the EHC 4 is connected to the negative electrode of the battery 13 via the switch 12, and the other end is directly connected to the positive electrode of the battery 13. Switch 12 is EC
On / off is controlled by a control signal from U9.

【００１７】排気通路２の吸着装置３とＥＨＣ４との間
には通路１１を介して二次空気供給装置１０が接続され
ており、二次空気供給装置１０が作動することにより、
排気通路２の途中に空気が供給される。二次空気供給装
置１０はＥＣＵ９に電気的に接続されており、その作動
がＥＣＵ９により制御される。A secondary air supply device 10 is connected between the adsorption device 3 and the EHC 4 in the exhaust passage 2 via a passage 11, and the operation of the secondary air supply device 10 causes the secondary air supply device 10 to operate.
Air is supplied in the middle of the exhaust passage 2. The secondary air supply device 10 is electrically connected to the ECU 9, and its operation is controlled by the ECU 9.

【００１８】吸着装置３は例えばデオライトという触媒
等を有するものであり、その温度が約２００℃以下では
未燃成分を吸着するが、それを越える温度では逆に吸着
した成分を脱離（パージ）する。The adsorbing device 3 has, for example, a catalyst such as deolite, and adsorbs unburned components at a temperature of about 200 ° C. or lower, but desorbs (purges) the adsorbed components at temperatures above that. To do.

【００１９】ＥＣＵ９はセンサ３，４からの入力信号波
形を整形し、電圧レベルを所定レベルに修正し、アナロ
グ信号値をデジタル信号値に変換する等の機能を有する
入力回路、中央演算処理回路（以下「ＣＰＵ」とい
う）、ＣＰＵで実行される各種演算プログラム及び演算
結果等を記憶する記憶部、二次空気供給装置１０及びス
イッチ１２に制御信号を供給する出力回路等から構成さ
れる。The ECU 9 shapes the input signal waveforms from the sensors 3 and 4, corrects the voltage level to a predetermined level, converts an analog signal value into a digital signal value, and the like, a central processing circuit ( Hereinafter, referred to as “CPU”), a storage unit that stores various calculation programs executed by the CPU and calculation results, an output circuit that supplies control signals to the secondary air supply device 10 and the switch 12, and the like.

【００２０】図２は、ＥＣＵ９におけるスイッチ１２の
オン／オフ制御、即ちＥＨＣ４のヒータへの通電制御を
行う処理のフローチャートである。なお、本処理は例え
ば一定時間毎に実行される。FIG. 2 is a flow chart of a process for performing on / off control of the switch 12 in the ECU 9, that is, control of energizing the heater of the EHC 4. It should be noted that this processing is executed, for example, at regular intervals.

【００２１】先ずステップＳ１で吸着装置３の温度ＴＡ
ＤＳ及びＥＨＣ４の温度ＴＥＨＣを読み込み、吸着装置
温度ＴＡＤＳが所定温度ＴＡＤＳ０より高いか否かを判
別する（ステップＳ２）。ＴＡＤＳ≦ＴＡＤＳ０が成立
し、吸着装置温度ＴＡＤＳが低いときはヒータをオフと
する（ステップＳ６）一方、ＴＡＤＳ＞ＴＡＤＳ０が成
立するときはさらにＥＨＣ温度ＴＥＨＣが所定温度ＴＥ
ＨＣ０（例えば３５０℃）より低いか否かを判別する
（ステップＳ３）。ＴＥＨＣ≧ＴＥＨＣ０が成立し、Ｅ
ＨＣ温度が高いときは、ヒータ（スイッチ１２）をオフ
とする（ステップＳ６）一方、ＴＥＨＣ＜ＴＥＨＣ０が
成立するときは、さらにエンジン１の始動後所定期間
（例えば６０秒）経過したか否かを判別する（ステップ
Ｓ４）。エンジン始動後所定期間経過前であれば、ヒー
タ（スイッチ１２）をオンする一方（ステップＳ５）、
経過後はヒータをオフとする（ステップＳ６）。First, in step S1, the temperature TA of the adsorption device 3 is
The temperatures TEHC of DS and EHC4 are read, and it is determined whether the adsorption device temperature TADS is higher than a predetermined temperature TADS0 (step S2). When TADS ≦ TADS0 is satisfied and the adsorption device temperature TADS is low, the heater is turned off (step S6), while when TADS> TADS0 is satisfied, the EHC temperature TEHC is further increased to the predetermined temperature TE.
It is determined whether the temperature is lower than HCO (for example, 350 ° C) (step S3). TEHC ≧ TEHC0 holds and E
When the HC temperature is high, the heater (switch 12) is turned off (step S6). On the other hand, when TEHC <TEHC0 is satisfied, it is further determined whether a predetermined period (for example, 60 seconds) has elapsed after the engine 1 is started. It is determined (step S4). If the predetermined period has not elapsed after the engine was started, the heater (switch 12) is turned on (step S5),
After a lapse of time, the heater is turned off (step S6).

【００２２】上記所定温度ＴＡＤＳ０は、吸着装置３が
吸着したＨＣ成分の脱離を開始する温度より低い温度で
あって、脱離開始時点までにＥＨＣ４及びその下流側の
触媒５，６が活性化しうる時間を考慮して決定されるも
のであり、例えば１５０℃程度に設定する。The predetermined temperature TADS0 is lower than the temperature at which the adsorber 3 starts desorbing the HC components adsorbed by the adsorber 3, and the EHC 4 and the catalysts 5, 6 on the downstream side thereof are activated by the time when the desorption starts. It is determined in consideration of the available time, and is set to about 150 ° C., for example.

【００２３】本実施例は、ＥＨＣ４は吸着装置３が脱離
を開始する時点までに活性化していれば足りる点に着目
したものであり、本実施例によれば、エンジン始動時に
ＥＨＣ温度ＴＥＨＣが低ければ（ＴＥＨＣ＜ＴＥＨＣ
０）、直ちにヒータへの通電を開始する従来の装置に比
べて、より適切な時期にヒータへの通電が開始されるの
で、ヒータによる電力消費を最小限に抑えることができ
る。This embodiment focuses on the point that the EHC 4 needs to be activated by the time when the adsorption device 3 starts desorption. According to this embodiment, the EHC temperature TEHC at the time of engine start is If it is low (TEHC <TEHC
0) As compared with the conventional device that immediately starts energizing the heater, energizing the heater is started at a more appropriate time, so that power consumption by the heater can be minimized.

【００２４】図３は、ＥＣＵ９における吸着装置３の劣
化判定処理のフローチャートである。本処理は例えば一
定時間毎に実行される。FIG. 3 is a flowchart of the deterioration determination process of the adsorption device 3 in the ECU 9. This process is executed, for example, at regular intervals.

【００２５】ステップＳ１１では、ＥＨＣ温度ＴＥＨＣ
を読み込み、次いで次式により温度上昇率ＲＴＥＨＣを
算出する（ステップＳ１２）。In step S11, the EHC temperature TEHC
Is read, and then the temperature rise rate RTEHC is calculated by the following equation (step S12).

【００２６】ＲＴＥＨＣ＝（ＴＥＨＣ（ｔ２）−ＴＥＨ
Ｃ（ｔ１））／（ｔ２−ｔ１） ここで、（ｔ２），（ｔ１）はそれぞれ時刻ｔ２，ｔ１
における検出値を意味する（図４参照）。RTEHC = (TEHC (t2) -TEH
C (t1)) / (t2-t1) where (t2) and (t1) are times t2 and t1, respectively.
Means the detected value in (see FIG. 4).

【００２７】次に、温度上昇率ＲＴＥＨＣが所定上昇率
ＲＴＥＨＣ０より小さいか否かを判別し（ステップＳ１
３）、ＲＴＥＨＣ＜ＲＴＥＨＣ０が成立するとき吸着装
置３は正常と判定する一方（ステップＳ１４）、ＲＴＥ
ＨＣ≧ＲＴＥＨＣ０が成立するとき吸着装置３は劣化し
ていると判定する（ステップＳ１５）。Next, it is judged whether or not the temperature increase rate RTEHC is smaller than a predetermined increase rate RTEHC0 (step S1.
3), when RTEHC <RTEHC0 is established, the adsorption device 3 is determined to be normal (step S14), while RTEHC
When HC ≧ RTEHC0 holds, it is determined that the adsorption device 3 is deteriorated (step S15).

【００２８】このように判定するのは、以下の理由によ
る。即ち、吸着装置３が正常であるときは、脱離が行わ
れない低温時であればＥＨＣ４に流れる排ガス中のＨＣ
成分は少なく、ＥＨＣ４におけるＨＣ酸化反応熱が少な
いので、ＥＨＣ４の温度上昇率ＲＴＥＨＣ（＝ΔＴＥＨ
Ｃ１／Δｔ）は小さくなる一方、吸着装置３が劣化した
ときは、低温時であってもＥＨＣ４へ流れる排ガス中の
ＨＣ成分が多くなり、ＨＣ酸化反応熱が多くなるので、
ＥＨＣ４の温度上昇率ＲＴＥＨＣ（＝ΔＴＥＨＣ２／Δ
ｔ）は大きくなる（図４参照）。従って、上昇率ＲＴＥ
ＨＣが所定上昇率ＲＴＥＨＣ０より大きいときは、吸着
装置３は劣化していると判定することができる。The reason for making this determination is as follows. That is, when the adsorption device 3 is normal, the HC in the exhaust gas flowing to the EHC 4 is at a low temperature where desorption is not performed.
Since there are few components and the heat of the HC oxidation reaction in EHC4 is small, the temperature rise rate RTEHC of EHC4 (= ΔTEH
While C1 / Δt) decreases, when the adsorption device 3 deteriorates, the HC component in the exhaust gas flowing to the EHC 4 increases and the HC oxidation reaction heat increases, even at low temperature.
EHC4 temperature rise rate RTEHC (= ΔTEHC2 / Δ
t) becomes large (see FIG. 4). Therefore, the rate of increase RTE
When HC is larger than the predetermined increase rate RTEHC0, it can be determined that the adsorption device 3 is deteriorated.

【００２９】このような判定処理は、吸着装置温度ＴＡ
ＤＳの低温時（脱離開始前）に行うことが好ましく、例
えばＥＨＣ４のヒータへの通電時に行うとよい。Such determination processing is performed by the adsorption device temperature TA.
It is preferable to carry out at a low temperature of DS (before the start of desorption), for example, at the time of energizing the heater of EHC4.

【００３０】本実施例によれば、吸着装置３の劣化を検
出することができるので、適切な処置をとることがで
き、良好な排気ガス特性を維持することができる。According to this embodiment, since the deterioration of the adsorption device 3 can be detected, appropriate measures can be taken and good exhaust gas characteristics can be maintained.

【００３１】[0031]

【発明の効果】以上詳述したように請求項１の排気ガス
浄化装置によれば、吸着手段の温度が検出され、少なく
とも検出した吸着手段の温度が所定温度以上であること
を条件として加熱手段が作動するので、従来に比べてよ
り適切な時期に加熱手段の作動が開始され、加熱手段に
よる電力消費を最小限に抑えることができる。As described above in detail, according to the exhaust gas purifying apparatus of the first aspect, the temperature of the adsorbing means is detected, and at least the detected temperature of the adsorbing means is equal to or higher than the predetermined temperature. Is activated, the operation of the heating means is started at a more appropriate time than in the conventional case, and power consumption by the heating means can be minimized.

【００３２】請求項２の排気ガス浄化装置によれば、浄
化手段の温度上昇特性が検出され、その温度上昇特性に
基づいて吸着手段の劣化が判定されるので、劣化してい
ると判定されたときは適切な処置をとることができ、良
好な排気ガス特性を維持することができる。According to the exhaust gas purifying apparatus of the second aspect, the temperature rising characteristic of the purifying means is detected, and the deterioration of the adsorbing means is judged based on the temperature rising characteristic. Therefore, it is judged that the adsorbing means is deteriorated. In this case, appropriate measures can be taken and good exhaust gas characteristics can be maintained.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の一実施例に係る排気ガス浄化装置の構
成を示す図である。FIG. 1 is a diagram showing a configuration of an exhaust gas purification device according to an embodiment of the present invention.

【図２】ヒータ付触媒のヒータへの通電を制御する処理
のフローチャートである。FIG. 2 is a flowchart of a process for controlling energization of a heater-equipped catalyst to a heater.

【図３】吸着装置の劣化判定を行う処理のフローチャー
トである。FIG. 3 is a flowchart of a process for determining deterioration of an adsorption device.

【図４】吸着装置の劣化判定手法を説明するための図で
ある。FIG. 4 is a diagram for explaining a method for determining deterioration of an adsorption device.

【符号の説明】[Explanation of symbols]

１ 内燃機関 ２ 排気通路 ３ 吸着装置 ４ ヒータ付触媒 ５ ライトオフ触媒 ６ 三元触媒 ７，８ 温度センサ ９ 電子コントロールユニット １２ スイッチ １３ バッテリ 1 Internal Combustion Engine 2 Exhaust Passage 3 Adsorption Device 4 Heater Catalyst 5 Light-Off Catalyst 6 Three-Way Catalyst 7, 8 Temperature Sensor 9 Electronic Control Unit 12 Switch 13 Battery

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ０１Ｎ 9/00 ＺＡＢ Ｚ Ｆ０２Ｄ 45/00 ３６０ Ｃ (72)発明者 加藤 裕明 埼玉県和光市中央１丁目４番１号 株式会 社本田技術研究所内 (72)発明者 斎藤 彰久 埼玉県和光市中央１丁目４番１号 株式会 社本田技術研究所内 (72)発明者 桶谷 利一 埼玉県和光市中央１丁目４番１号 株式会 社本田技術研究所内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location F01N 9/00 ZAB Z F02D 45/00 360 C (72) Inventor Hiroaki Kato Central 1 Wako, Saitama Prefecture 4-1-1, Honda Technical Research Institute, Ltd. (72) Inventor, Akihisa Saito, 4-1-1 Chuo, Wako-shi, Saitama, Ltd. Honda Technical Research Institute, Ltd. (72) Riichi Okebaya, Central, Wako-shi, Saitama 1-4-1 Stock Company Honda Technical Research Institute

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 内燃機関の排気通路に設けられ、排気ガ
ス中の未燃成分を吸着する吸着手段と、該吸着手段の下
流側に設けられ、排気ガスを浄化する触媒を有する浄化
手段と、該浄化手段の触媒を電気的に加熱する加熱手段
とを備えた内燃機関の排気ガス浄化装置において、 前記吸着手段の温度を検出する吸着手段温度検出手段
と、少なくとも前記検出した吸着手段の温度が所定温度
以上であることを条件として前記加熱手段を作動させる
制御手段とを設けたことを特徴とする内燃機関の排気ガ
ス浄化装置。1. An adsorbing means provided in an exhaust passage of an internal combustion engine for adsorbing unburned components in exhaust gas, and a purifying means provided downstream of the adsorbing means and having a catalyst for purifying exhaust gas, In an exhaust gas purifying apparatus for an internal combustion engine, comprising: a heating means for electrically heating a catalyst of the purifying means, an adsorbing means temperature detecting means for detecting a temperature of the adsorbing means, and at least a detected temperature of the adsorbing means. An exhaust gas purifying apparatus for an internal combustion engine, comprising: a control unit that operates the heating unit on condition that the temperature is equal to or higher than a predetermined temperature. 【請求項２】 内燃機関の排気通路に設けられ、排気ガ
ス中の未燃成分を吸着する吸着手段と、該吸着手段の下
流側に設けられ、排気ガスを浄化する触媒を有する浄化
手段とを備えた内燃機関の排気ガス浄化装置において、 前記浄化手段の温度を検出する浄化手段温度検出手段
と、 前記浄化手段の温度上昇特性を検出する温度上昇特性検
出手段と、 該検出した温度上昇特性に基づいて前記吸着手段の劣化
状態を検出する劣化状態検出手段とを設けたことを特徴
とする内燃機関の排気ガス浄化装置。2. Adsorption means provided in the exhaust passage of the internal combustion engine for adsorbing unburned components in the exhaust gas, and purification means having a catalyst for purifying the exhaust gas, provided downstream of the adsorption means. In an exhaust gas purifying apparatus for an internal combustion engine, comprising: a purifying means temperature detecting means for detecting a temperature of the purifying means, a temperature rising characteristic detecting means for detecting a temperature rising characteristic of the purifying means, and the detected temperature rising characteristic. An exhaust gas purifying apparatus for an internal combustion engine, comprising: a deterioration state detecting means for detecting a deterioration state of the adsorbing means based on the deterioration state detecting means. 【請求項３】 前記浄化手段の触媒を電気的に加熱する
加熱手段を設け、前記温度上昇特性検出手段は、前記加
熱手段の作動中に前記温度上昇特性を検出することを特
徴とする請求項２記載の内燃機関の排気ガス浄化装置。3. A heating means for electrically heating the catalyst of the purifying means is provided, and the temperature rise characteristic detecting means detects the temperature rise characteristic during operation of the heating means. 2. An exhaust gas purification device for an internal combustion engine according to 2.
JP6052669A 1994-02-25 1994-02-25 Exhaust gas purification device for internal combustion engine Expired - Fee Related JP2983429B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP6052669A JP2983429B2 (en) 1994-02-25 1994-02-25 Exhaust gas purification device for internal combustion engine
US08/391,029 US5634331A (en) 1994-02-25 1995-02-21 Exhaust gas-purifying device for internal combustion engines
US08/728,977 US5713198A (en) 1994-02-25 1996-10-11 Exhaust gas-purifying device for internal combustion engines

Applications Claiming Priority (1)

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JP6052669A JP2983429B2 (en) 1994-02-25 1994-02-25 Exhaust gas purification device for internal combustion engine

Publications (2)

Publication Number Publication Date
JPH07238826A true JPH07238826A (en) 1995-09-12
JP2983429B2 JP2983429B2 (en) 1999-11-29

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